[68c10owner]

what is the .050 duration of that camshaft? Did you degree it? What ICL?

"machined and cleaned", does that mean they are stock? No porting? stock valve size?

Also, you will make more power with a tunnel ram if the engine is built right but you need to pick the correct carbs and dial them in. Those 450 carbs are not great. No accelerator pump. Pick up a couple of 1850 600cfm carbs at the minimum. Some 660 center squirters would be ideal but they are not street friendly but can be modified to work well on the street.

There are much better camshafts out there than the Thumper series cams.

BTW, a domed piston with the early closed chamber oval heads will make much more than 9.4:1 compression. What is the piston part number? Honestly it sounds like a mismatch of parts. I would probably rethink some parts depending on your budget and what you are trying to do with this thing.